Hey, do you have a short guide of what you've done so far?
So far all I have done is trying to get the OS to install. In doing so I followed the first set of tutorials on the Surface Pro 2 thread (under the header: "Surface Pro 2 Gen Steps"). The only modifications I needed to do was to utilize the config.plist that I have posted above in place of the one the tutorial tells us to use. This got me into the installer and into the OS.
I haven't had time to toy with anything else but as I said there isn't much left to try and fix. We need to get the Type Cover to work and iron out the graphical artifacts the screen has when in the OS. I'm thinking that the artifacts can be taken care of if we can get the right DSDT, any DSDT Modifications, as well as an adjusted conflg.plist. The type cover currently isn't working in Linux either so I'm suspecting it's due to a unsupported USB chipset. Something I'm sure that can be fixed with the right KEXT.